Robert friedel



(No Model.)

B. PRIEDEL. GLASS GRINDING MACHINERY.

No. 477,839. Patented June 28, I892.

Hum 11 Illl N J k v Q a I m I @Wf'k f w 1 i g I N s? %Q@@ Q/ on As UNITED STATES PATENT OFFICE.

ROBERT FRIEDEL, OF STUTTGART, GERMANY.

GLASS-GRINDING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 477,839, dated June 28, 1892. Application filed November 3, 1891. Serial No. 410,754. (No model.)

To all whom it may concern: 7

Be it known that I, ROBERT FRIEDEL, a citizen of the Kingdom of Wiirtemberg, residing at Stuttgart, Wiirtemberg, in the German Empire, have invented a new and useful Improvement in Glass-Grinding Machinery, of which the following is a specification.

My present invention relates to glass-grinding machines for oval glasses having a swinging balanced frame, upon which the abrading-disk S is journaled, so as to occupy a horizontal instead of a vertical position. The

grinding is performed, not by the cylindrical surface of the disk, but by its lower fiat surface. Manifestly by reversing the disk S upon its shaft or spindle 10 its upper surface may also be employed for grinding.

In the drawings, Figures 1 and 2 represent a grinding-machine embodying my invention in side elevation and front elevation, respectively; and Fig. 3 represents a plan thereof, in which, however, the abradingwheel 8 and its frame G, the standard T, and the oval mechanism 0 have been omitted to make the parts to be protected in my claim more distinctly visible.

The shaft to of the horizontal abradingdisk S is journaled in the frame G, and the latter loosely encircles the power-shaft w, so as to be adapted to oscillate on the same. The sliding counter-weight G, mounted on the frame G, serves to regulate the pressure of the abrading-disk S The abrading-disk is actuated by belt 15 from the power-shaft 20, passing around the shaft w of the abradingdisk. In order to arrest the abrading-disk S in a given position-i. e., to prevent the further descent of the swinging frame G when the correct bevel has been ground-the screws table S. The support S and the clutch or oval mechanism 0, with the glass 0, may be secured in any position by the segmental guide-strips a, provided with arc-shaped slots, and the thumb-screws a, engaging the slots in a well-known manner. The angle of the bevels is increased or diminished according as the support S is lowered or raised.

For grinding larger glasses it is advisable, instead of mounting the oval mechanism 0, with support S and table S, on the support F, which carries the carriage b" and standard T, supporting the frame G, to mount the same upon a separate frame, which may be made adjustable with respect to F, so that glasses of all dimensions may be ground.

I claim In glass-grinding machines, the combination of a machine-support, a table vertically adjustable thereon, and a support, as S pivoted thereon and bearing a glass-holding chuck, with segmental strips and thumb-screws for securing the chuck-support in various positions of adjustment, substantially as set forth.

In testimony whereof I have signed this specification in the presence'of two subscribing witnesses. p p

' ROBERT FRIEDEL. Witnesses:

AUGUST B. DRAUTZ,

VCARL DUSSMANN: 

